Water-gate.



Patented Aug. 26, |902.

n. N. B. comm WAT E R G AT E.

(Application filed Oxrt. 19, 1001.)

(No Model.)

Fig'. 3.

IN VEN T OR.

WITNESSES UNrTnn STATES PATENT Ormea.

DAVID N. B. COFFIN, OF NEWTON, MASSACHUSETTS, ASSIGNOR TO COFFIN VALVE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

WATER-GATE.

SPECIFILCATION forming part of Letters Patent No. 707,825, dated August 26, 1902.

Application filed October 19, 1901. Serial No. 79,313. (No model.)

To cti/ w/'Lomf it may concern.-

Be it known that I, DAVID N. B. COFFIN, a citizen of the United States, residing in the city of Newton, county of Middlesex, and

State of Massachusetts, have invented an Improvement in Vater-Gates, of which the following is a specification, reference being had to accompanying drawings, forming a part hereof, and to the letters of reference marked 1o thereon.

This invention relates to the construction of the valve and to its mechanical adaptation to the requirements of the gate-body and its conditions.

I5 The object of the invention is to render the valve more perfectlyself-adj ustingin relation to its seats, both with reference to imperfections in construction and also to all variations caused by pressure Within and forces acting 2o Withoutupon the gate-body, between the seatfaces of which the valve must accurately t to produce a non-leaking gate; also, to produce an economically-constructed and every other Way efiicient valve and gate, of which it constitutes an important and vital part.

The adverse conditions to he met and overcome are, briefly, the liability to imperfect relative coincidence and alinement of valve seat and faces, first, from imperfect construc-l tion; second, from unequal springing or yielding of the gate-body from internal pressures, and, thirdly, from forces Without tending to strain, spring, or in any Way displace the perfect adjustment of the valve-seats in such manner as to disturb the normal position and adjustment of the valve-seat faces in the body. The overcoming of these difficulties has heretofore been sought in the use of some sort of double-disk and other forms of valve; but they have failed, because the equal'and eifective self-adjusting quality has not been attained in consequence of a construction which could not permit uniform yielding and self-adjustment; but the present annular concentric union of the disks,which are themselves uniform and circular, does meet the case in an effective manner.

I will proceed to describe my invention, referring to the drawings, of which- 5o Figure 1 is a view, looking in the line of the stem,of a valve,illustrating the improvement. Fig. 2 is a view from one side looking transversely to the stem. Fig. 3 is a face view. Fig. 4 is a view of one disk and shows a section through the concentric annular union or connection between the two disks. Fig. 5 is a sectional view of the valve, the plane of section being coincident With the axis of the stem. Fig. 6 is a side View of the nut o. as made to lock freely into the valve. Fig. 7 is 6o a view at right angles'to that of Fig. (i. Fig. S is a sectional view of valve and body, taken at right angles to that of Fig. 5. Fig. 9 is a general side view of a gate having a part broken out to expose the valve Within and joined by iiange and spigot to a pipe-line. Fig. 10 shows the union divided and bolted together, as sometimes in cases of great magnitude becomes necessary. Fig. 1l is a face view of the same. Fig. 12 is a sectional view 7o corresponding to Fig. l0. Fig. 13 is a side View of a valve having attached a traveling screw-stem, While in other views a local stemvalve is shown.

Like letters refer to the same or corresponding parts in all the figures.

The disks are marked a. The connection or union connecting the disks together is marked b. In thisisshownanopeningmarked Z,'through which the local or non-traveling 8o screw-stem may pass when the valve is opening.

The nut in which the local screw-stem engages to open and close the gate may be fixed in an attached hub, as shown in Fig. 5, a4, or it may fit loosely in lugs or pockets a5, as shown in Figs. l, 2, 3, 4, and 10.

`When the traveling screw-stem'is-used, it is keyed or pinned in the hub a?, as shown in Fig. 13. 9o

The valve-disks a are ordinarilymade in the form of a somewhat-flattened dome (see Figs. 1, 2, 5, S, 9, dro.) for greater strength;

but in any case they Will have'more or less of the spring quality, and being made entirely circular and the union connecting them being circular and located concentrically in relation to the disks and seats these circular and concentric qualities insure an eqnalized pressure upon all parts of the seat-faces. If roo the seat-faces fail to be formed on perfectlycoincident lines or angles, there is the spring or yielding quality which, joined to the described uniform and symmetrical qualities, insure to the utmost a perfectly-fitting joint between the valve and its seats, and so, also, if by anyoutside force, as by the uneven end pressure of heavy pipe ends, the body parts and valve-seats are caused to diverge in the least degree from their normal position the deviation is compensated for by these selfadjusting qualities of the valve so constructed. It will be noted, however, that the great importance of the improvement is developed mainly in the construction of large gatesas, for instance, four feet, five feet, eight feet, and upward in diameter-while at the same time it is useful also in gates of smaller diameter.

The union in a large gate being located midway from center to the circumference of the valve is so great a factor in the equalization of all distorting strains as nearly or wholly to neutralize them. y

The annular union connecting the two disks is preferably made of about one-half the diameter of the valve and radially is about the average thickness of the valve-disk. When the screw is local-t1 e., when it does not travel with the valve-the union is usually made of sufficient length axially to separate the disks so far as to permit the screw-stem to pass between them and through the hole Z in the union.

In cases of considerable magnitude, where it becomes necessary to cast the disks separately, they are provided with bolting-plates c and bolts d for bolting them together. The body of the Valve is marked h and its cap z'. A spigot end is shown at f, Fig. 9, and a flange end at g, connecting the gate in a pipe-line. The valve is provided with usual guides a2 and the gate with guides as, in which the valve-'guides freely play in the usual manner. The screw-stem is marked e, audits wrench or key-head is marked j. (See Fig. 9.) Astem to travel with the valve is shown in Fig. 13 and a non-traveling or local stem in Fig 9. Otherwise than as specified these valves are of the usual and ordinary materials, construction, castings, dac., and may be adapted' to nearly every possible requirement, and from the foregoing description it is deemed that their great superiority and efficiency will be made quite obvious.

What I claim, and desire to secure by Letters Patent, is as follows:

l. The combination of two flattened-domeshaped valve-disks having seat-faces in relatively angular relation to each other and the annular union or ring connection uniting them, said union being concentrically arranged in relation to the valve-faces or bases of resistance and to the valve center, substantially as shown and described.

2. In a gate for Water and other fluids, having double or twin valve-seats, the two spring valve-disks having seat-faces at their periphery and an annular union or connection concentrically connecting said disks and seatfaces substantially as shown and described.

3. In a water-gate, or gate for any Huid, having two relatively angular-faced valveseats, a Valve constructed with two spring valve-disks having faces corresponding to the seat-faces and an annular union or connection arranged midway from center to seat-faces and concentrically to the seats connecting them together, substan tially as shown and described.

4t. In a gate for water or other fluids having twin valve-seats between which is forced a taper valve for closing and from between which the valve is withdrawn for opening, by a valve-stem, the two spring valve-disks united together by an annular connection arranged midway between center and seats and concentrically in relation to both center and seat-faces, substantially as shown and described.

5. The twin disks constructed each with its own attached part of the annular union separate from the other and having within the circle of the u nion a web or plate c joined to each such separate part of the union by which it may be bolted to the other part, and boltholes and the bolts CZ bolting them together and so completing the union, substantially as shown and described.

DAVID N. B/COFFIN.

Witnesses:

GEORGE W. JACKSON, F. E. ADAMS. 

